Gem-setting.



Patented Dec. 25, I900.

D. W. COSTIGAN.

GEM SETTING.

1 (Application filed Ap 14, 1900.1

!No Modem UNITED STATES PATENT OFFIQE.

DENNIS W. COSTIGAN, OF PROVIDENCE, RHODE ISLAND.

GEM-SETTING.

SPECIFICATION forming part of Letters Patent No. 664,725, dated December00- Applioation filed April 14, 1900.

T0 aZZ whom it may concern:

Be it known that I, DENNIS W. COSTIGAN, a citizen of the United Statesof America, residing at No. 30 Prairie avenue, in the city and county ofProvidence, in the State of Rhode Island, have invented certain new anduseful Improvements in Gem-Settings, of which the following is aspecification.

My invention relates to a gem-setting for rings; and the object of myinvention is to provide a setting upset and out, respectively, from onepiece of sheet metal, so as to have a series of prongs exposed toreceive a series of gems, as hereinafter described and claimed.-

Referring to the drawings, Figure 1 is a top plan of the strip of metalfrom which the gem-settings are struck up. Fig. 2 is a top plan view ofthe blank as cut from the said strip of metal to form my improvedsetting. Fig. 3 is an edge view of the same. Fig. 4 is a top plan viewof the blank, showing the result of the second operation, whereby thedie upsets the blank to the required shape for cutting. v Fig. 5 is alongitudinal sectional view taken in line mm of the same. Fig. 6 is aninverted view of Fig. 4. Fig. 7 is a top plan view of the blank andshowing the result of the third operation after it has been cut by asuitable die. Fig. 8 is a perspective view of the gem-setting andshowing the sides of the same turned upward and ready to receive thestones. Fig. 9 is an inverted view of Fig. 8. Fig. 10 represents a sideelevation of the ring complete.

Similar letters of reference indicate corresponding parts in thediii'erent figures of the drawings.

My improved gem-setting is made from a plain strip of gold or othermetallic stock A, and by means of a suitable die and plunger I form ablank B, shown in Fig. 2, having its longitudinal edges b to surroundthe body portion in a segmental form and its end edges 1) converginginwardly to a point 79 of the center of the blank.

For the purpose of illustrating my improvement I show a blank struck upand forming three settings from one piece of stock. The blank B is nextcarried to a second die and plunger, which upsets the stock into a formC, as shown in Figs. 4, 5, and 6, having acentral longitudinal portion(1, curved, as shown in Fig. 5, and extending from the said curvedSerial No. 12,934. (No model.)

portion to the-outer side edges b b of the stock are angle-walls e 6,having their apex f divided equidistant from each other upon either sideof the blank 0, as indicated in Fig. 4. At the outer extremity of eachangle-wall e the die compresses the stock thinner to form a shoulder g,and from the bottom edge of each angle-wallthe stock is rounded over, asseen at h. In a third operation the last-aforesaid blank is cut by a dieinto the form D, as shown in Fig. 7, said die cutting from the apex ofthe angle-walls at a point 11 to the points j j (see Fig. 4) and thenceinwardly upon each of the rounded portions h to a point is, and thecut-away portions of the angle-Walls e e form the prongs to receive thestones; The sides of the blank D are then turned upward from each outeredge of the central portion at to the shape as seen in Fig. 8, and thehoop or band E is secured by soldering to each end portion of thesetting at a point l l, as shown in Fig. 10, after which a gem m isplaced within each of the series of four prongs and resting upon theshoulders g, and the extending port-ions of the prongs are then bentover the edge of the gem to secure it in place.

By-this construction I make by a simple method a series of two or moresettings,united to and integral with the next adjacent setting, from onepiece of stock and does not require any soldering of one with the other.

I claim as a novel and useful invention and desire to secure by LettersPatent The herein-described gem-setting D, upset and cut, respectively,from one piece of sheet metal, said piece having a central longitudinalcurved portion d with, outwardly-extending angle-walls e e, each of saidwalls cut inwardly to form prongs, each of said prongs provided with ashoulder g, so constructed that when the sides of said piece are bent upward aseries of prongs are exposed to receive a series of gems, incombination therewith of the band E having each end united to each endof the said piece D by solder, substantially as described.

Signed by me at Providence, Rhode Island, this 12th day of April, A. D.1900.

DENNIS W. GOSTIGAN.

Witnesses:

TERENCE M. OREILLY, VIGTOR'DE LA BARRE.

